Pump



May 22, 1923.

R. HILDEBRAND PUMP Filed March 14, 1921 5'/ .Dayan/230m V jected to a very high pressure.

Patented li/lay 22, i923.

-. iran sra REINHARD HILDEBRAND, 0F VTEBSTER GROVES, MISSOURI, ASSIGNOR TO FULTON IRON WORKS COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF DELAWARE.

PUMP.

Application filed March 14, 1921. Serial No. 452,302.

To all, whom it may concern:

Re it known that l, Rami-inno HILDE- BRAND, a citizen oi? Germany, and a .resident o1 Webster Groves, in the county of St. Louis and State of Missouri, have invented certain new and useful Improvements in Pumps, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates to improvements in pumps, and more particularly to a pump adapted to be actuated by a reciprocating member such the piston oi an engine. pump oi: this type may be used to force a vliuid ot' any kind, for example oil, to the piston of an internal combustion engine.

The object of the invention is to produce a simple and highly cilicient pump of this kind. More specifically stated, an object is to avoid the severe stresses which ordinarily result from a sudden or rapid movement of the movable element of the pump. In the preferred form of the invention, the pump is actuated through the medium of a striking member carried by the reciprocating piston of the engine and adapted to engage the movable pumping member in such a manner that the latter is suddenly actuated by thc engine piston. The movable pumping member receives a hammer blow which is struck by the movable striking member, and as a result of the'sudden and rapid motion. fluid in the pump is momentarily sub- To relieve this pressure, the pump is preferably provided with an open inlet vpermitting backward flow of some of the Huid in response to the pressure transmitted from the striking member.

A further object is to provide a simple automatic valve device whereby the liuid passageway of the pump is positively opened at the beginning of the discharge stroke of the pump. This valve device -preferably includesa valve secured to one of the pumping members and adapted to engage a valve seat in theother pumping member, so that when the movable pumping member is in motion the valve will be positively separated from its seat. The valve preferably cooperates with its seat to form a stop device for limiting the movement of the movable pumping member, and if a spring is used to restore the movable pumping member, this spring can also serve as means for closing the valve device. Furthermore, the valve may be adjusted, as will be hereafter described, to vary the starting position of the movable pumping member.

With the foregoing and other objects in view, the invention comprises the novel construction, combination and arrangement of parts hereinafter morespecilically described and illustrated in the accompanying drawings wherein is shown the preferred embodiment of the invention. However, it is to be understood that the invention compre- A hends changes, variations and modifications which come within the scope ot the claims hereunto appended.

Fig. l is a vertical section illustrating certain parts of an engine equipped with my pump, the latter beingshown in elevation.

Fig. 2 is an enlarged vertical section illustrating the pump.

Fig. 3 is a vertical section, partly in elevation, showing the striking member whereby the pump is actuated.

The engine herein shown comprises a cylinder l.. a piston 2 adapted to reciprocate in the cylinder, a piston pin, or wrist pin, 3 mounted in the piston. a crank 4 located below the cylinder, and a connecting rod 5 whereby the piston pin 3 is connected to the crank pin 4. These elements may form parts of an internal combustion engine, and they may be constructed in any suitable manner.

The pump herein disclosed is adapted to Form part of the means for lubricating the engine, although it is to be understood that the invention is not limited tol such use. The piston pin 3 is provided with an inletpassageway 6 communicating with a longitudinal passageway 7 which leads to a transverse passageway 8, the latter terminating at the periphery of the piston pin.v After the pin has been drilled to form these passageways, the upper end of passageway 6 may be closed by a plus" 9 and one end of passageway 7 may be closed by a plug 10. 11 designates an inlet port formed in the piston 2 and communicating with the inlet passageway 6 in the piston pin. A tube 12 is screwed into the port Al1 and a striking member 13 is screwed onto the lower end of said tube. The striking member 13 is thus 'carried by the piston to which it is preferably secured by means of the tube l2 and also by means striking Imember 13 (Fig. 3) is provided with anv inlet port 15 which is normally closed by a check valve 16 having a noneircular extension 17. 18 designates a spring tending to retain the check valve 16 Iin its closed position, said spring being in- .terposed between the top of the valve extension 17 and the bottom of a spring seat 19, f the latter `being 'formed by a washer having a central'opei'iing through which the oil is disehargedi'rom the striking member to the tube 12. l

'As an illustration of a pumping device embodying the 'featuresot' this invention` l have shown a movable pumping element A and a stationary pumping element B telescopl in g therewith. The movable pumping element comprises tubular' plunger 2O having a longitudinal passageway for the discharge of oil and also having avalve seat 21 in said passageway. A v metal washer 22 is seated Aon the t'op ot thelplunger 2() and an 'abutment 23, preferably made ot fiber, is seated lon kth-ewtop of `this washer'. A ring 24 is screwed onto the upper end of plunger 20 and provided with an inturned flange 2) adapted to bear upon an outward-ly extending ilange on'the abutment 23 so as to fimly secure the latter to the plunger 2O.v The ringV '24:' may be split transversely,` as suggested at 211 in Fig. 2, and after this siplit ring has been tightenedit may be locked `through the medium of a clamping boltv 26 whereby the ring is contracted to gri-p the threaded upperend of the plunger The washer` 22 and abutment 23 are provided with central openings through which the oil Iis discharged from the pump.

The malin function off the washer 22 is to -Yprovide a substantial bearing surface for the .liber abutment 23l The stationary pumping element B cornprises a tube, or cylinder, 27 in which the plunger 2O is slid'ably mounted, said tube i 27 being screwed int-o a bracket 28 which is bushing 30 -is 'screwed into they lower end of this tube to receive a conductor 31 whereby oil transmitted to the pump.` :This conductor preferably'leadsy from. a point higher than the pump, so that the oil can'lowv by gravity to the pump. A stationary vcheckvalve 32 (Fig. .2) engaging the valve `seat 21, is provided with along stem 33l adjustably secured in the tube 27, the lower end of said stem being screwedinto the ported wall 3&1 near the lower end ot tube 27. 30 designates a transverse pin (Fig. 2) whereby the valve stem 33 is secured after it has been properly adjustedjin the-ported `wall v3e. Guide ribs 35 may be `formed on the yvalve stem 33 so as to engage the wall ot the longitudinal passageway in the plunger 20. 36 designatesI a restoring spring whereby theyplunger 20 ier-.moved4 to its elevated position, shown by Fig. 2, said spring being interposed -between and engaged with the plunger 20 and theported wall 34.

The discharge passageway *formed in the plunger 2() Vmay be closed by the valve 32, but the inlet at the lower end of the pump is always open. The valve 32 is secured to a stationary part ot lthe pump, but it cooperates with a valve seat on 'the movable plunger 20, and it serves as means for limiting the upward motion oi" the plunger. It is to beunderstood that the plunger' 20 is moved upwardly through the medium of the restoring spring 36, and that 1 this spring tends to retain the valve seat 21 in engagement with the stationary valve 32. The operation of the device may be briefly described as follows:

During each downward stroke ot the engine piston 2, the striking member 13 engages the abutment 23 at the vtop oft' the movable pumping element, thereby forcing the plunger 2O downwardly in the' tubev 27. At this time,- the inlet port 15 (Fig. in the bottom ofthe' striking' membery 13, registers with the CeIItralopening in ltheabutment 23, and as rthe piston continues its downward motion, 'oilvl is forced from the pump and through the striking member 13 and'tube 12 to the 4piston pin 3. During the upward stroke-of the engine piston, the striking member 13 passes `from' the abutment 23,` as suggested "by Figs. 2 and 3,

and the spring 36 restores the pump; plunger V20 to the position shown( by Fig. 2. The striking member 13 is carried by the. engine piston and it moves very rapidly, with the yresult of striking severe hammer lblows on the abutment 23, lthereby transmitting vsudden and rapid' movements toY the pum-p plunger 20. In response to these sudden movements, some of the oil is forcedv backwardly through the restricted inlet ports 29 at the" lower end of the pumping device, said ports being constantly open to relieve the pressure resulting from the sudden motion of Vthe pump plunger 20. j

At the beginning vvoli each downward stroke of the 'pump plunger 20, the oil should be permitted to freely escape past the valve 32. lt is therefore important to note that the plunger 20 carries the valve seat 2l, and that this seat must more downwardly with the plunger so as to positively open the valve device at the beginning of the downward motion of the pump plunger.

l claim:

l. A pump comprising two pumping elements one of which is movable relative to the other so as to force fluid through the pump, and operating means comprising a striking member movable into and out of engagement with the movable pumping element, said striking member and movable pumping element having registering discharge passageways through which fluid is discharged while the striking member is engaged with the movable pumping element, and the other pumping element having an open inlet permitting reflux of some of the Huid in response to the pressure transmitted from said striking member.

2. A pump comprising twopumping elements one of which is movable relative to the other so as to force fluid through the pump, and operating means comprising a striking member movable into and out of engagement with the movable pumping element, said striking member and movable pumping element having registeringr discharge passageways through which fluid is discharged while the striking member is engaged with the movablepumping element, said movable pumping element being provided with a discharge valve adapted tol close the discharge passageway therein, and the other pumping element having a constantly open inlet permitting reflux of some of the fluid in response to the pressure transmitted from said striking member.

3. A pump comprising two pumping elements one of which is movable relative to the other so as to force fluids through the pump, and operating means comprising a striking member movable into and out of engagement with the movable pumping element, said striking member and movable pumping element having registering discharge passageways through which fluid is discharged while the striking member is engaged with the movable pumping element, said striking member and movable pumping element being provided with check valves permitting the discharge of. fluid thro-ugh said passageways, and the other pumping element having a constantly open inlet permitting reflux-of some of the fluid in response to the pressure transmitted from said striking member.

4. In a machine having a reciprocating piston, a pumpcomprising two pumping elements one of whichA is movable relative to the other so as to force fluid through the pump, a striking member carried by said reciprocating piston and movable into and out of engagement with the movable pumping element, said striking member and movable pumping element having registering discharge passageways through which fluid is discharged while the striking member is engaged with the movable pumping element, and the other pumping element having a constantly open inlet permitting reflux of some of the fluid in response to thev pressure transmitted from said striking member.

5. ln a machine having a reciprocating piston, an oil pump comprising a stationary pumping element and a movable pumping element cooperating therewith to force the oil through the pump, a striking member carried by said reciprocating piston and movable into and out of engagement with said movable pumping element, said striking member and movable pumping element having registering oil passageways through which the oil is discharged to said reciprocating piston, and said stationary pumping element having an open inlet permitting refluxv of some of toe fluid in ,response to the pressure transmitted from said striking member.

6. ln a machine having a reciprocating piston, a pump comprising a pumping ele-.

ment movable with said reciprocating piston, and a stationary pumping element cooperating with said movable pumping element to force fluid through the pump, said movable pumping with a discharge passageway leading to said piston, and said stationary pumping element having an o-pen inlet permitting reflux of some of the fluid in response to the pressure transmitted from said reciprocating piston.

7. In a machine having a reciprocating piston, a pump comprising a pumping element movable with said reciprocating piston, and a stationary puuiping element cooperating` with said movable pumping element to force fluid through the pump, said movable pumping element being provided with a discharge passageway leading to said piston and a check valve preventing reflux of fluid in said discharge passageway, said stationary pumping element having a constantly open inlet permitting reflux Of some of the fluid in response tou the pressure transmitted from said reciprocating piston.

8. A pump comprising two pumping elements one of which is movable relative to the other to force fluid through the pump, one of said pumping elements having a passageway for the fluid and a valve seat in said passageway, and a valve secured to the other pumping element and adapted to engage said valve seat.

9. A pump comprising two pumping elements one of which is movable relative to element being provided vthe other toloree fluid through the pump, `one oi2 said pumping' elements having av -i'i'assag'eway or the lluid and a valve seat in said passageway, a valve secured to the other pumping' element and adapted toengage said valve seat so'as to limit the ino-` ti'on'o'l the movable pumi'nng,r element, and

a spring' (.:ooperatii'ig with 'said ii'iovable pum-ping element to yieldingly retain said `valve seat and valve in engagement with v, 'each other.

l0. A pump comprisingr two pumping' eiements one of ,which is movable relative to .the other to i'oree fluid through the pump,

one ro'-said pumping' elements having a passageway for the Huid and a valve seatI said passageway, a valve secured to the other p'uinping'element and 'adapted to engage said valve seat and a sl'jring' Cooperating with said movable pumping;V element to close said vfalve.

1l. A pump comprising' two pumping elements one ofwhieh is movable rela-tive to the other so as to force fluid through the pump, and operating' means comprising` a striking` member movable into and out of engagement with the movable pumping ele ment, said striking' membei' and movable pumping;r element hai/*inw registering discharge passageways through vwhich 'Fluid -is 'discharged while the striking member isenraged with the movable pumping' element,

the .discharge passageway in said movable 'pumping element being provided with a.

valve seat, and a valve seeu'redto the other pumpingy element and adapted to engage said valve seat so as to limit the motion of said movable pumping element.

12A pump .Comprising a stationary pumping element, a movablepumping ele*4 ment Cooperating with:saidstationary element to 'for-ee Huid through the pump, said movable pumpingr element having a diseharg'e passageway for the liuidanda valve seat in said discharge passageway, and a valve secured to the stationary puinpi'ng element and adapted to` engage said valve seat.

13. A' pump comprising; a stationary pumping element, a movable pumping elerment eooperating'wit-h said'stationary elepumping element having 'fi-discharge passageway and a valve seati'therein,l a striking member adapted lto engage lsaid movable pumping element to impart movement there? to, a valve adjustably lseeured to said stationary pumping element and adapted to en- .,e'ag'e said valve seat so as to limit themoi tion of' said movable pumping' element, and a restoring' spring cooperating with said movable` pumping element to force said valve seat into `engagement with said valve'.

In testimony that' I claim the foregoing I hereunto aHX my signature. i

Beinamen HILDEBRAND. 

